<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon :closable="false">
            </el-alert>
            <!-- 步骤条组件 -->
            <el-steps :space="200" :active="activeIndex -0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="{
                                expandTrigger: 'hover',
                                ...cateProps,
                                // checkStrictly: 'true'
                                }"
                                @change="handleChange" clearable>
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 商品参数复选框区域 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload
                            :action="uploadUrl"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                            <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <quill-editor v-model="addForm.goods_introduce">
                        </quill-editor>
                        <!-- 添加商品按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览对话框 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%">
            <img :src="this.previewPath" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
    data() {
        return {
            //动态激活steps索引
            activeIndex:'0',
            //获取商品分类数据
            catelist:[],
            //指定级联选择器配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
        },
            //动态参数列表数据
            manyTableData:[],
            //静态属性参数列表数据
            onlyTableData:[],
            //上传根路径
            uploadUrl:'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件设置的请求头
            headerObj:{
                Authorization : window.sessionStorage.getItem('token')
            },
            //图片预览的路径
            previewPath:'',
            //预览图片对话框的显示与隐藏
            previewVisible:false,
            //添加的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                //商品所属的分类
                goods_cat:[],
                //图片的数组
                pics:[],
                //商品的详情描述
                goods_introduce:'',
                attrs:[]

            },
            //添加表单的验证规则
            addFormRules:{
                goods_name:[
                    { required: true, message: '请输入商品的名称', trigger: 'blur' }
                ],
                goods_price:[
                    { required: true, message: '请输入商品的价格', trigger: 'blur' }
                ],
                goods_weight:[
                    { required: true, message: '请输入商品的重量', trigger: 'blur' }
                ],
                goods_number:[
                    { required: true, message: '请输入商品的数量', trigger: 'blur' }
                ],
                goods_cat:[
                    { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            }

        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        //获取所有商品分类数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status != 200){
                 return this.$message.error('获取商品分类数据失败!')
            }else{
                this.catelist = res.data
                // console.log(this.catelist)
            }
        },
        //级联选择器选项变化触发的函数
        handleChange(){
            // console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length !=3){
                this.$message.warning('请选择三级分类')
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请先选择商品分类!')
                return false
            }else{

            }
        },
        async tabClicked(){
            //访问动态参数面板
            if(this.activeIndex === '1'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:'many'}
                 }
                )
            if(res.meta.status != 200){
                return this.$message.error('获取动态参数列表失败！')
             }else{
                // console.log(res.data)
                res.data.forEach(item =>{
                    //字符串变数组的操作
                    item.attr_vals=
                item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
             }
            }else if (this.activeIndex === '2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:'only'}
                 }
                )              
                if(res.meta.status != 200){
                    return this.$message.error('获取静态属性列表失败！')
              }else{
                  this.onlyTableData = res.data
              }
            }
        },
        //处理图片预览效果
        handlePreview(file){
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        //处理移除图片的操作
        handleRemove(file){
            const filePath = file.response.data.tmp_path
            const i = this.addForm.pics.findIndex((x)=>
                x.pic === filePath
            )
            this.addForm.pics.splice(i,1)
            console.log(this.addForm)
        },
        //监听图片上传成功的事件
        handleSuccess(response){
            console.log(response)
            const picsInfo = {
                //pic临时路径
                pic:response.data.tmp_path
            }
            this.addForm.pics.push(picsInfo)
            console.log(this.addForm)
        },
        //添加商品
        add(){
             this.$refs.addFormRef.validate(async valid =>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }
                //执行添加的业务逻辑
                //lodash cloneDeep(obj)
                    const form =_.cloneDeep(this.addForm)
                    form.goods_cat=
                form.goods_cat.join(',')
                //处理动态参数和静态属性
                this.manyTableData.forEach(item=>{
                    const newInfo = {
                        attr_id:item.attr_id,
                        attr_value:item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                this.onlyTableData.forEach(item=>{
                    const newInfo = {
                        attr_id:item.attr_id,
                        attr_value:item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form)
                //发起请求添加商品
                    const  {data:res} = await this.$http.post('goods',form)
                    if(res.meta.status != 201){
                        this.$message.error('创建商品失败！')                       
                    }else{
                        this.$message.success('创建商品成功！')
                        this.$router.push('/goods')
                    }   
             })

             
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }else{
                return null
            }
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0!important
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 10px;
}
</style>